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STM32F427xx STM32F429xx Electrical characteristics
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6.3.26 FMC characteristics
Unless otherwise specified, the parameters given in Table 86  to Table 101 for the FMC 
interface are derived from tests performed under the ambient temperature, f
HCLK 
frequency 
and V
DD
 supply voltage conditions summarized in Table 1 7, with the following configuration: 
• Output speed is set to OSPEEDRy[1:0] = 10 except at V
DD
 range 1.7 to 2.1V where 
OSPEEDRy[1:0] = 11 
• Measurement points are done at CMOS levels: 0.5V
DD
Refer to Section 6.3.17: I/O port characteristics for more details on the input/output 
characteristics.
Asynchronous waveforms and timings
Figure 55 through Figure 58 represent asynchronous waveforms and Table 86 through 
Table 93  provide the corresponding timings. The results shown in these tables are obtained 
with the following FMC configuration:
• AddressSetupTime = 0x1
• AddressHoldTime = 0x1
• DataSetupTime = 0x1 (except for asynchronous NWAIT mode , DataSetupTime = 0x5)
• BusTurnAroundDuration = 0x0
• For SDRAM memories, V
DD
 ranges from 2.7 to 3.6 V and maximum frequency 
FMC_SDCLK = 90 MHz
• For Mobile LPSDR SDRAM memories, V
DD
 ranges from 1.7 to 1.95 V and maximum 
frequency FMC_SDCLK = 84 MHz
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